Question

I need help with this. Could someone explain how to solve this question? A simple explanation, please. The explanations I'm seeing seem to confuse me a lot.

Answer 1

Explanation:

given

a(-23) &b(5)

if you take this as a continuous graph

AB+BC =28

ATQ,

AB/BC=2/5

28-bc/BC=2/5

140-5BC=2BC

140=7BC

BC=20

B is -15